Evaluating a piece of art can depend on the specific genre and the intended message or style the artist aims to convey. However, if you are seeking a single criterion that broadly applies to various types of art, "Use of color to emphasize a particular area of the drawing" is often a strong choice.
This criterion allows for an assessment of how effectively the artist captures attention and conveys emotion or meaning through color. It can apply across different genres, be it abstract, impressionistic, or even in photorealistic works, and it plays a crucial role in guiding the viewer’s experience and understanding of the artwork.
While the other criteria (proper proportions, multiple textures, technical skills for photorealism) are important, they may be more specific to certain styles (like realism or certain forms of abstraction), whereas the use of color is more universally applicable.